21214423144 has 16 divisors (see below), whose sum is σ = 39796355520. Its totient is φ = 10602061680.

The previous prime is 21214423133. The next prime is 21214423151. The reversal of 21214423144 is 44132441212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626202 + ... + 659209.

It is an arithmetic number, because the mean of its divisors is an integer number (2487272220).

Almost surely, 2^21214423144 is an apocalyptic number.

It is an amenable number.

21214423144 is a deficient number, since it is larger than the sum of its proper divisors (18581932376).

21214423144 is a wasteful number, since it uses less digits than its factorization.

21214423144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287480 (or 1287476 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

Adding to 21214423144 its reverse (44132441212), we get a palindrome (65346864356).

The spelling of 21214423144 in words is "twenty-one billion, two hundred fourteen million, four hundred twenty-three thousand, one hundred forty-four".